■ Feature
Canned food is built for the purpose of preservation of a period in food over a long period of time.Mothballing is possible, and since the canned food itself can save cheap, economical, and precooked food, foods with high nutritive value can be saved.
■ Were made why Bottling in which mothballing is possible was invented by French Nicola Appert in 1804 by the collection from Napoleon currently afflicted by the food problem at the time of an expedition.However, since it said that a glass bottle was heavy and it was easy to damage it, the canned food which will put food into metal containers by Peter Durant of Britain in 1810 was invented.It seems that however, pains were taken to open since there was no can opener those days.

■ Feature
In the thing of freeze-drying technology, this is freezing the food materials which processed heating, seasoning, etc.Beforehand and containing moisture in old things about minus 30 ℃, and also decompressing, making moisture sublimate by a vacua, and drying.There is little change of the nutritional information and the flavor which the food itself has, and since it is a part for low-water flow, carrying is very easy lightly.And it is possible to save at normal temperature for a long period of time.
■ Were made why
Full-fledged research was started in the 1950s for the purpose of the weight saving of a takeout food military in the United States, and freeze-dry was developed.In recent years, the space foods adapting the technology which is made to dry instant food and a liquid and can be saved, or the technology of freeze-dry are developed.

■ Feature
Aiming at preservation of a period over a long period of time, the thing of the food in a frozen state is said.Fresh fresh materials are quick-frozen, and after prepared food carries out cooking processing, and quick-freezing, it is saved by 18 minus.Fresh flavor and nutrient can be maintained.
■ Were made why In order to convey the strawberry which is not nonperishable in the United States, it is said that it is beginning to have frozen the strawberry.Although we have been anxious about losing things and the taste with bad resistance to the teeth at the beginning when frozen food began, in recent years, it has been improved by quick-freezing technology having been developed.

■ Feature
It seals with a container with airtightness or a light blocking effect, and says the thing of the food which carried out pressurization heat pasteurization.By pressurization heat pasteurization, botulinus bacillus with high heat resistance can be sterilized now also in common food poisoning bacteria.

■ Were made why
It was made from the aim which solves the problem of the empty can processing which is a canned demerit.Compared with canned food, it is convenient to carry and can also finish processing easily.In the Apollo Project, a pouch-packed food is adopted as space foods, and is maintaining popularity as a processed food which can be saved at normal temperature even in Japan.

■ Feature
Emergency provisions do not require time and effort for cooking, it is convenient to carry and also it is the feature that nutritive value is high and it is substantial.For example, there is rice called alphaized rice.There is processing rice which carried out fast drying, and it can return with boiling water for about 30 minutes, it can return in about 70 minutes with water, and he can eat.The latest one of texture is good and has various variations, such as boiled rice mixed with meat and vegetables, rice boiled with red beans, and fried rice.Moreover, there is also a biscuit convenient for preservation or a cellular phone burned firmly by the time-tested product of emergency provisions called Campan.A retention period is about five years.There are some in which rock candy and konpeito are contained together with Campan, and there is this in order to compensate sugar, and to make saliva easy to come out of.In addition, there are a preservation can etc. which a retention period will have for 20 years or more.■ Were made why
When emergencies which are not understood when it happens, such as a disaster and dispute, happen, reservation of food, drinking water, etc. is very difficult.It was made in order to prevent it and to prepare in advance.